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Stereo Amp Overheating

Posted by gemo (My Page) on
Thu, Jan 25, 07 at 11:26

I have a 15+ yr old stereo (integrated AM/FM, phono, Amp - with external speakers) that has a pretty good sound and I use for my workshop.

The sound output is now low and a bit distorted (with a slight hum) and checking inside, the heat sinks for the o/p power transistors (both channels) are running very hot (can't touch) - even with the speaker wires disconnected.

I guess something is shorting... but no visible evidence of any problems - eg. the speaker wires aren't touching etc.

Don't want to spend a lot of money on fixing this unit and I'm quite handy with electronic repairs but I'm wondering where the obvious place is to start troubleshooting?

Many thanks for any ideas...

Follow-Up Postings:

RE: Stereo Amp Overheating

The hum portion could be a filter capacitor leaking or going bad. With a VOM, you can check the Output transistors and see if they are reading properly.
Go HERE to help you check transistors if need be.

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